dasd_erp.c (5349B)
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Horst Hummel <Horst.Hummel@de.ibm.com> 5 * Carsten Otte <Cotte@de.ibm.com> 6 * Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Bugreports.to..: <Linux390@de.ibm.com> 8 * Copyright IBM Corp. 1999, 2001 9 * 10 */ 11 12#define KMSG_COMPONENT "dasd" 13 14#include <linux/ctype.h> 15#include <linux/init.h> 16 17#include <asm/debug.h> 18#include <asm/ebcdic.h> 19#include <linux/uaccess.h> 20 21/* This is ugly... */ 22#define PRINTK_HEADER "dasd_erp:" 23 24#include "dasd_int.h" 25 26struct dasd_ccw_req * 27dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize, 28 struct dasd_device * device) 29{ 30 unsigned long flags; 31 struct dasd_ccw_req *cqr; 32 char *data; 33 int size; 34 35 /* Sanity checks */ 36 BUG_ON(datasize > PAGE_SIZE || 37 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 38 39 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 40 if (cplength > 0) 41 size += cplength * sizeof(struct ccw1); 42 if (datasize > 0) 43 size += datasize; 44 spin_lock_irqsave(&device->mem_lock, flags); 45 cqr = (struct dasd_ccw_req *) 46 dasd_alloc_chunk(&device->erp_chunks, size); 47 spin_unlock_irqrestore(&device->mem_lock, flags); 48 if (cqr == NULL) 49 return ERR_PTR(-ENOMEM); 50 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 51 INIT_LIST_HEAD(&cqr->devlist); 52 INIT_LIST_HEAD(&cqr->blocklist); 53 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 54 cqr->cpaddr = NULL; 55 if (cplength > 0) { 56 cqr->cpaddr = (struct ccw1 *) data; 57 data += cplength*sizeof(struct ccw1); 58 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 59 } 60 cqr->data = NULL; 61 if (datasize > 0) { 62 cqr->data = data; 63 memset(cqr->data, 0, datasize); 64 } 65 cqr->magic = magic; 66 ASCEBC((char *) &cqr->magic, 4); 67 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 68 dasd_get_device(device); 69 return cqr; 70} 71 72void 73dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) 74{ 75 unsigned long flags; 76 77 spin_lock_irqsave(&device->mem_lock, flags); 78 dasd_free_chunk(&device->erp_chunks, cqr); 79 spin_unlock_irqrestore(&device->mem_lock, flags); 80 atomic_dec(&device->ref_count); 81} 82 83 84/* 85 * dasd_default_erp_action just retries the current cqr 86 */ 87struct dasd_ccw_req * 88dasd_default_erp_action(struct dasd_ccw_req *cqr) 89{ 90 struct dasd_device *device; 91 92 device = cqr->startdev; 93 94 /* just retry - there is nothing to save ... I got no sense data.... */ 95 if (cqr->retries > 0) { 96 DBF_DEV_EVENT(DBF_DEBUG, device, 97 "default ERP called (%i retries left)", 98 cqr->retries); 99 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 100 cqr->lpm = dasd_path_get_opm(device); 101 cqr->status = DASD_CQR_FILLED; 102 } else { 103 pr_err("%s: default ERP has run out of retries and failed\n", 104 dev_name(&device->cdev->dev)); 105 cqr->status = DASD_CQR_FAILED; 106 cqr->stopclk = get_tod_clock(); 107 } 108 return cqr; 109} /* end dasd_default_erp_action */ 110 111/* 112 * DESCRIPTION 113 * Frees all ERPs of the current ERP Chain and set the status 114 * of the original CQR either to DASD_CQR_DONE if ERP was successful 115 * or to DASD_CQR_FAILED if ERP was NOT successful. 116 * NOTE: This function is only called if no discipline postaction 117 * is available 118 * 119 * PARAMETER 120 * erp current erp_head 121 * 122 * RETURN VALUES 123 * cqr pointer to the original CQR 124 */ 125struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) 126{ 127 int success; 128 unsigned long startclk, stopclk; 129 struct dasd_device *startdev; 130 131 BUG_ON(cqr->refers == NULL || cqr->function == NULL); 132 133 success = cqr->status == DASD_CQR_DONE; 134 startclk = cqr->startclk; 135 stopclk = cqr->stopclk; 136 startdev = cqr->startdev; 137 138 /* free all ERPs - but NOT the original cqr */ 139 while (cqr->refers != NULL) { 140 struct dasd_ccw_req *refers; 141 142 refers = cqr->refers; 143 /* remove the request from the block queue */ 144 list_del(&cqr->blocklist); 145 /* free the finished erp request */ 146 dasd_free_erp_request(cqr, cqr->memdev); 147 cqr = refers; 148 } 149 150 /* set corresponding status to original cqr */ 151 cqr->startclk = startclk; 152 cqr->stopclk = stopclk; 153 cqr->startdev = startdev; 154 if (success) 155 cqr->status = DASD_CQR_DONE; 156 else { 157 cqr->status = DASD_CQR_FAILED; 158 cqr->stopclk = get_tod_clock(); 159 } 160 161 return cqr; 162 163} /* end default_erp_postaction */ 164 165void 166dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) 167{ 168 struct dasd_device *device; 169 170 device = cqr->startdev; 171 if (cqr->intrc == -ETIMEDOUT) { 172 dev_err(&device->cdev->dev, 173 "A timeout error occurred for cqr %p\n", cqr); 174 return; 175 } 176 if (cqr->intrc == -ENOLINK) { 177 dev_err(&device->cdev->dev, 178 "A transport error occurred for cqr %p\n", cqr); 179 return; 180 } 181 /* dump sense data */ 182 if (device->discipline && device->discipline->dump_sense) 183 device->discipline->dump_sense(device, cqr, irb); 184} 185 186void 187dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) 188{ 189 struct dasd_device *device; 190 191 device = cqr->startdev; 192 /* dump sense data to s390 debugfeature*/ 193 if (device->discipline && device->discipline->dump_sense_dbf) 194 device->discipline->dump_sense_dbf(device, irb, "log"); 195} 196EXPORT_SYMBOL(dasd_log_sense_dbf); 197 198EXPORT_SYMBOL(dasd_default_erp_action); 199EXPORT_SYMBOL(dasd_default_erp_postaction); 200EXPORT_SYMBOL(dasd_alloc_erp_request); 201EXPORT_SYMBOL(dasd_free_erp_request); 202EXPORT_SYMBOL(dasd_log_sense); 203